:root {
  --nord0: #2e3440;
  --nord1: #3b4252;
  --nord2: #434c5e;
  --nord3: #4c566a;
  --nord4: #d8dee9;
  --nord5: #e5e9f0;
  --nord6: #eceff4;
  --nord7: #8fbcbb;
  --nord8: #88c0d0;
  --nord9: #81a1c1;
  --nord10: #5e81ac;
  --nord11: #bf616a;
  --nord12: #d08770;
  --nord13: #ebcb8b;
  --nord14: #a3be8c;

  --bg-color: var(--nord0);
  --text-color: var(--nord4);
  --topbar-bg: rgba(46, 52, 64, 0.85);
  --topbar-border: var(--nord2);
  --title-color: var(--nord6);
  --subtitle-color: var(--nord8);
  --btn-bg: var(--nord1);
  --btn-text: var(--nord5);
  --btn-border: var(--nord3);
  --btn-hover-border: var(--nord9);
  --lane-bg: rgba(59, 66, 82, 0.75);
  --lane-border: var(--nord2);
  --lane-header-text: var(--nord6);
  --count-color: var(--nord8);
  --drop-zone-bg: rgba(136, 192, 208, 0.12);
  --card-bg: linear-gradient(180deg, rgba(76, 86, 106, 0.7), rgba(67, 76, 94, 0.95));
  --card-border: var(--nord3);
  --card-text: var(--nord5);
  --focus-ring: rgba(136, 192, 208, 0.28);
  --focus-bg: rgba(143, 188, 187, 0.08);
  --link-color: var(--nord8);
  --link-hover: var(--nord7);
  --empty-hint: var(--nord9);
  --handle-separator: rgba(46, 52, 64, 0.45);
  --handle-text: var(--nord6);
  --meta-text: var(--nord9);
  --due-none-bg: rgba(136, 192, 208, 0.15);
  --due-none-text: var(--nord8);
  --due-upcoming-bg: rgba(163, 190, 140, 0.2);
  --due-upcoming-text: var(--nord14);
  --due-soon-bg: rgba(235, 203, 139, 0.2);
  --due-soon-text: var(--nord13);
  --due-today-bg: rgba(208, 135, 112, 0.22);
  --due-today-text: var(--nord12);
  --due-overdue-bg: rgba(191, 97, 106, 0.22);
  --due-overdue-text: var(--nord11);
  --bg-glow-1: rgba(94, 129, 172, 0.2);
  --bg-glow-2: rgba(136, 192, 208, 0.15);
}

body.theme-light {
  --bg-color: var(--nord6);
  --text-color: var(--nord1);
  --topbar-bg: rgba(236, 239, 244, 0.9);
  --topbar-border: var(--nord4);
  --title-color: var(--nord1);
  --subtitle-color: var(--nord10);
  --btn-bg: #e9edf4;
  --btn-text: var(--nord1);
  --btn-border: #c7d0df;
  --btn-hover-border: var(--nord10);
  --lane-bg: rgba(229, 233, 240, 0.85);
  --lane-border: #c7d0df;
  --lane-header-text: var(--nord1);
  --count-color: var(--nord10);
  --drop-zone-bg: rgba(129, 161, 193, 0.18);
  --card-bg: linear-gradient(180deg, #f8f9fc, #e7ebf3);
  --card-border: #c4cddd;
  --card-text: var(--nord1);
  --focus-ring: rgba(94, 129, 172, 0.32);
  --focus-bg: rgba(129, 161, 193, 0.12);
  --link-color: var(--nord10);
  --link-hover: var(--nord9);
  --empty-hint: var(--nord10);
  --handle-separator: rgba(76, 86, 106, 0.35);
  --handle-text: var(--nord1);
  --meta-text: var(--nord3);
  --due-none-bg: rgba(94, 129, 172, 0.14);
  --due-none-text: var(--nord10);
  --due-upcoming-bg: rgba(163, 190, 140, 0.22);
  --due-upcoming-text: #4a6b3e;
  --due-soon-bg: rgba(235, 203, 139, 0.26);
  --due-soon-text: #805f16;
  --due-today-bg: rgba(208, 135, 112, 0.24);
  --due-today-text: #8f4f34;
  --due-overdue-bg: rgba(191, 97, 106, 0.24);
  --due-overdue-text: #8f2f39;
  --bg-glow-1: rgba(143, 188, 187, 0.3);
  --bg-glow-2: rgba(129, 161, 193, 0.2);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Avenir Next", "Segoe UI", sans-serif;
  color: var(--text-color);
  background:
    radial-gradient(circle at 20% 0%, var(--bg-glow-1) 0%, transparent 40%),
    radial-gradient(circle at 90% 100%, var(--bg-glow-2) 0%, transparent 35%),
    var(--bg-color);
}

.topbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1.25rem;
  border-bottom: 1px solid var(--topbar-border);
  background: var(--topbar-bg);
  backdrop-filter: blur(6px);
  position: sticky;
  top: 0;
  z-index: 2;
}

h1 {
  margin: 0;
  font-size: 1.5rem;
  color: var(--title-color);
}

.subtitle {
  margin: 0.25rem 0 0;
  color: var(--subtitle-color);
  font-size: 0.9rem;
}

.toolbar {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.btn {
  border: 1px solid var(--btn-border);
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.55rem 0.8rem;
  border-radius: 0.65rem;
  font-size: 0.9rem;
  cursor: pointer;
}

.btn:hover {
  border-color: var(--btn-hover-border);
}

.btn.primary {
  background: linear-gradient(135deg, var(--nord10), var(--nord9));
  border-color: transparent;
  color: var(--nord6);
}

.btn.btn-load {
  background: linear-gradient(135deg, var(--nord14), var(--nord7));
  border-color: transparent;
  color: var(--nord1);
}

.btn.btn-save {
  background: linear-gradient(135deg, var(--nord11), var(--nord12));
  border-color: transparent;
  color: var(--nord6);
}

.btn.btn-tags {
  background: linear-gradient(135deg, #6a4c79, #b48ead);
  border-color: transparent;
  color: var(--nord6);
}

.btn.btn-drive {
  background: linear-gradient(135deg, #7a5d3a, #a37c40);
  border-color: transparent;
  color: var(--nord6);
}

.hidden {
  display: none;
}

.tags-panel {
  margin: 0.9rem 1rem 0;
  padding: 0.85rem;
  border: 1px solid var(--lane-border);
  border-radius: 0.8rem;
  background: var(--lane-bg);
}

.drive-panel {
  margin: 0.9rem 1rem 0;
  padding: 0.85rem;
  border: 1px solid var(--lane-border);
  border-radius: 0.8rem;
  background: var(--lane-bg);
}

.drive-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.4rem;
}

.drive-panel-header h2 {
  margin: 0;
  font-size: 1rem;
  color: var(--title-color);
}

.drive-note {
  margin: 0 0 0.55rem;
  color: var(--meta-text);
  font-size: 0.82rem;
}

.drive-controls {
  display: grid;
  gap: 0.36rem;
  margin-bottom: 0.6rem;
}

.drive-controls label {
  font-size: 0.8rem;
  color: var(--meta-text);
}

.drive-controls input {
  border: 1px solid var(--btn-border);
  border-radius: 0.5rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.42rem 0.52rem;
}

.drive-buttons {
  display: flex;
  gap: 0.45rem;
  flex-wrap: wrap;
}

.drive-status {
  margin: 0.1rem 0 0;
  font-size: 0.82rem;
  color: var(--subtitle-color);
}

.tags-panel-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 0.5rem;
}

.tags-panel-header h2 {
  margin: 0;
  font-size: 1rem;
  color: var(--title-color);
}

.tags-list {
  display: grid;
  gap: 0.35rem;
  margin-bottom: 0.65rem;
}

.tag-row {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.28rem 0.35rem;
  border: 1px solid var(--btn-border);
  border-radius: 0.5rem;
  background: rgba(46, 52, 64, 0.08);
}

.tag-swatch {
  width: 0.72rem;
  height: 0.72rem;
  border-radius: 50%;
  flex: 0 0 auto;
}

.tag-name {
  font-size: 0.82rem;
  flex: 1;
}

.tags-empty {
  margin: 0;
  color: var(--meta-text);
  font-size: 0.82rem;
}

.tag-create {
  display: flex;
  gap: 0.5rem;
}

.tag-create input {
  flex: 1;
  border: 1px solid var(--btn-border);
  border-radius: 0.5rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.42rem 0.52rem;
}

main {
  padding: 1rem;
}

.board {
  display: grid;
  grid-template-columns: repeat(4, minmax(220px, 1fr));
  gap: 1rem;
}

.lane {
  background: var(--lane-bg);
  border: 1px solid var(--lane-border);
  border-radius: 1rem;
  min-height: 62vh;
  display: flex;
  flex-direction: column;
}

.lane-header {
  padding: 0.9rem 0.9rem 0.3rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  color: var(--lane-header-text);
}

.lane-title {
  margin: 0;
  font-size: 1rem;
}

.count {
  font-size: 0.8rem;
  color: var(--count-color);
}

.cards {
  flex: 1;
  padding: 0.6rem;
  border-radius: 0.85rem;
  margin: 0.4rem;
  transition: background 160ms ease;
}

.cards.drag-over {
  background: var(--drop-zone-bg);
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--card-border);
  border-radius: 0.75rem;
  margin-bottom: 0.6rem;
  overflow: hidden;
  color: var(--card-text);
}

.card.selected {
  box-shadow: 0 0 0 2px var(--nord8);
}

.card.dragging {
  opacity: 0.75;
  transform: scale(0.99);
}

.card.drop-before {
  box-shadow: inset 0 3px 0 0 var(--nord8);
}

.card.drop-after {
  box-shadow: inset 0 -3px 0 0 var(--nord8);
}

.card-handle {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  border: 0;
  border-bottom: 1px solid var(--handle-separator);
  padding: 0.24rem 0.4rem 0.24rem 0.45rem;
  gap: 0.3rem;
}

.card-drag {
  flex: 1;
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--handle-text);
  padding: 0.12rem 0.2rem;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-align: left;
  cursor: grab;
  user-select: none;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.card-drag:active {
  cursor: grabbing;
}

.card-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.2rem;
}

.card-action {
  border: 0;
  background: rgba(46, 52, 64, 0.22);
  color: var(--handle-text);
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 0.35rem;
  line-height: 1;
  font-size: 0.95rem;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.card-action:hover {
  background: rgba(46, 52, 64, 0.36);
}

.card-action.delete {
  color: var(--nord11);
  font-weight: 700;
}

.card-body {
  padding: 0.65rem;
  min-height: 2.6rem;
  line-height: 1.4;
  outline: none;
  white-space: pre-wrap;
  word-break: break-word;
}

.card-body:focus {
  box-shadow: inset 0 0 0 2px var(--focus-ring);
  background: var(--focus-bg);
}

.card-body a {
  color: var(--link-color);
}

.card-body a:hover {
  color: var(--link-hover);
}

.card-meta {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.5rem;
  padding: 0.45rem 0.65rem 0.62rem;
  border-top: 1px solid var(--handle-separator);
  color: var(--meta-text);
  font-size: 0.75rem;
}

.meta-created {
  white-space: nowrap;
}

.due-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.due-summary {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}

.due-input {
  border: 1px solid var(--btn-border);
  border-radius: 0.4rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  padding: 0.14rem 0.26rem;
  font-size: 0.72rem;
}

.due-chip {
  border-radius: 999px;
  padding: 0.12rem 0.42rem;
  font-weight: 600;
  white-space: nowrap;
}

.due-chip.due-none {
  background: var(--due-none-bg);
  color: var(--due-none-text);
}

.due-chip.due-upcoming,
.due-chip.due-later {
  background: var(--due-upcoming-bg);
  color: var(--due-upcoming-text);
}

.due-chip.due-done {
  background: var(--due-upcoming-bg);
  color: var(--due-upcoming-text);
}

.due-chip.due-soon {
  background: var(--due-soon-bg);
  color: var(--due-soon-text);
}

.due-chip.due-today {
  background: var(--due-today-bg);
  color: var(--due-today-text);
}

.due-chip.due-overdue {
  background: var(--due-overdue-bg);
  color: var(--due-overdue-text);
}

.card-action.due-clear {
  width: 1.1rem;
  height: 1.1rem;
  font-size: 0.75rem;
}

.tag-controls {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.45rem;
}

.tag-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.28rem;
}

.tag-chip {
  border: 1px solid var(--btn-border);
  background: transparent;
  border-radius: 999px;
  padding: 0.1rem 0.45rem;
  font-size: 0.7rem;
  cursor: pointer;
}

.tag-empty {
  color: var(--meta-text);
  font-size: 0.72rem;
}

.tag-picker {
  border: 1px solid var(--btn-border);
  border-radius: 0.4rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 0.72rem;
  padding: 0.14rem 0.24rem;
  max-width: 6.5rem;
}

.card.collapsed {
  margin-bottom: 0.5rem;
}

.card.lane-backlog .card-handle {
  background: linear-gradient(135deg, var(--nord10), var(--nord9));
}

.card.lane-in-progress .card-handle {
  background: linear-gradient(135deg, var(--nord8), var(--nord7));
}

.card.lane-review .card-handle {
  background: linear-gradient(135deg, var(--nord13), var(--nord12));
}

.card.lane-done .card-handle {
  background: linear-gradient(135deg, var(--nord14), var(--nord7));
}

.empty-hint {
  color: var(--empty-hint);
  opacity: 0.75;
  font-size: 0.85rem;
  padding: 0.5rem;
}

.theme-switch {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  margin-left: 0.2rem;
  color: var(--btn-text);
  font-size: 0.85rem;
  user-select: none;
}

.theme-switch input {
  position: absolute;
  opacity: 0;
  pointer-events: none;
}

.theme-slider {
  width: 2.35rem;
  height: 1.35rem;
  border-radius: 999px;
  background: var(--nord3);
  border: 1px solid var(--btn-border);
  position: relative;
  transition: background 160ms ease;
}

.theme-slider::after {
  content: "";
  width: 0.95rem;
  height: 0.95rem;
  border-radius: 50%;
  background: var(--nord6);
  position: absolute;
  top: 0.14rem;
  left: 0.16rem;
  transition: transform 160ms ease;
}

.theme-switch input:checked + .theme-slider {
  background: var(--nord10);
}

.theme-switch input:checked + .theme-slider::after {
  transform: translateX(0.98rem);
}

.theme-switch input:focus-visible + .theme-slider {
  box-shadow: 0 0 0 2px var(--focus-ring);
}

.shortcuts-legend {
  position: fixed;
  right: 0.9rem;
  bottom: 0.9rem;
  z-index: 5;
  max-width: 22rem;
  border: 1px solid var(--lane-border);
  border-radius: 0.65rem;
  background: var(--topbar-bg);
  color: var(--text-color);
  padding: 0.3rem 0.55rem;
}

.shortcuts-legend summary {
  cursor: pointer;
  font-size: 0.82rem;
  color: var(--subtitle-color);
}

.shortcuts-legend ul {
  margin: 0.45rem 0 0.2rem;
  padding-left: 1.05rem;
  font-size: 0.78rem;
}

.shortcuts-legend p {
  margin: 0.2rem 0 0.35rem;
  font-size: 0.75rem;
  color: var(--meta-text);
}

.shortcuts-legend kbd {
  border: 1px solid var(--btn-border);
  border-radius: 0.35rem;
  padding: 0.04rem 0.3rem;
  background: var(--btn-bg);
  color: var(--btn-text);
  font-size: 0.72rem;
  font-family: "SFMono-Regular", Menlo, monospace;
}

@media (max-width: 900px) {
  .board {
    grid-template-columns: repeat(2, minmax(220px, 1fr));
  }
}

@media (max-width: 620px) {
  .topbar {
    flex-direction: column;
    align-items: flex-start;
  }

  .board {
    grid-template-columns: 1fr;
  }

  .lane {
    min-height: 30vh;
  }
}